THYRIDIDAE OF AFRICA AND ITS ISLANDS 67 



- Eyes without interfacetal hairs . . . . . . . . 10 



9 (8) Uncus bifid, two narrow processes. Female with signum as PI. 54, fig. 316 



guttistigma (p. 80) 



- Uncus with broad lateral process (PI. 29, fig. 158). Female with signum as in 



PI. 52, fig. 305 . . . . . . . . eguttalis (p. 67) 



10 (8) Radial veins R 2 to R B in fore wing separately from cell. (Vindicta species-group, 



only separable on male genitalia) . . . . . . . . 11 



- Some of veins R t to R 6 fused for at least part of length . . . . 12 



11 (10) Bifid uncus (PI. 32, fig. 176) ....... ramosa (p. 79) 



- Single uncus .......... vindicta (p. 77) 



12 (10) Fore wing with R t +R b . Valve of male genitalia reduced. Female with 



signum (PI. 53, fig. 306) ....... clathrata (p. 70) 



- Fore wing with R 4 + R 5 and R 2 +R 8 . Female without signum . rothi (p. 68) 



Group i 



Species in this group have a peg-like gnathus in the male genitalia. The divisions 

 in Striglina could be made in several ways based on wing venation or the presence or 

 absence of interfacetal hairs. Neither of these ways seem to produce any obvious 

 advantage over the division adopted. Whilst the close proximity of eguttalis and 

 guttistigma is obtained, for example, if the division is based on the presence of 

 interfacetal hairs in the eyes and the separateness of Sc + R 1 and Rs in the hind 

 wing, numerous aspects in the genitalia (cf. PI. 29, fig. 158 and PI. 31, fig. 171, $; 

 and PI. 52, fig. 303 and PI. 54, fig. 315, $) are very different. Although the weighting 

 of characters is not entirely desirable, it is difficult to reconcile the evidence from the 

 genitalia (based on a number of characters, although for convenience used only as the 

 form of the gnathus) compared with the fusion for part of their length of wing veins 

 (which are known to vary within species and occasionally within specimens) and the 

 presence of interfacetal hairs. The fusion of veins in the hind wing occurs in a 

 number of genera but interfacetal hairs have been found only in species of Striglina, 

 as has the peg-like gnathus. In the absence of fossil or other evidence, the results 

 obtained using comparative morphology to determine relationship are controversial. 

 The classification produced in this genus should be regarded firstly as a convenient 

 division enabling identification and only secondly, as an attempt to show possible 

 relationships. 



The CLATHRATA -Group 



This species-group includes clathrata, rothi and eguttalis. These species have 

 Sc + R x and Rs free in the hind wing. 5. eguttalis has R 2 to R 5 from the cell in the 

 fore wing, interfacetal hairs and tarsi with one pair of apical spines on each segment. 

 This contrasts with the other species where R t and R 5 have a common stalk, the tarsi 

 have rows of spines and the eyes are without hairs. The species, S. minutula 

 Saalmuller, from Madagascar is also in this species-group. 



Striglina eguttalis Gaede 



(PI. 6, fig. 24; PI. 29, figs 158, 159; PL 52, figs 303-305; Text-fig. 9) 



Striglina eguttalis Gaede, 1917 : 378. 

 Striglina eguttalis Gaede; Gaede, 1929 : 495. 



